38194021 has 2 divisors, whose sum is σ = 38194022. Its totient is φ = 38194020.

The previous prime is 38193983. The next prime is 38194049. The reversal of 38194021 is 12049183.

It is a happy number.

38194021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (38194049) can be obtained adding 38194021 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33524100 + 4669921 = 5790^2 + 2161^2 .

It is a cyclic number.

It is not a de Polignac number, because 38194021 - 2¹¹ = 38191973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38194061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19097010 + 19097011.

It is an arithmetic number, because the mean of its divisors is an integer number (19097011).

Almost surely, 2^38194021 is an apocalyptic number.

It is an amenable number.

38194021 is a deficient number, since it is larger than the sum of its proper divisors (1).

38194021 is an equidigital number, since it uses as much as digits as its factorization.

38194021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 38194021 is about 6180.1311474758. The cubic root of 38194021 is about 336.7687571753.

The spelling of 38194021 in words is "thirty-eight million, one hundred ninety-four thousand, twenty-one".